When taking a soil sample, what is the recommended depth for sampling?

The recommended depth for taking a soil sample is generally accepted as being 3-4 inches. This depth ensures that the sample represents the material that is most likely to be affected by vegetation and human activities, as well as providing a good indication of the soil's lead concentration or contamination levels. Sampling at this depth allows for a thorough analysis of the upper layer of soil, which is crucial for assessing risks related to lead exposure, particularly in residential areas or places where children play. The 3-4 inch depth captures enough of the soil profile to be meaningful without being overly intrusive, which can occur at greater depths. This approach aligns with best practices in environmental assessments and remediation planning.